pub enum TrapReason {
    User {
        error: Error,
        needs_backtrace: bool,
    },
    Jit {
        pc: usize,
        faulting_addr: Option<usize>,
    },
    Wasm(Trap),
}
Expand description

Enumeration of different methods of raising a trap.

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User

Fields

§error: Error

The actual user trap error.

§needs_backtrace: bool

Whether we need to capture a backtrace for this error or not.

A user-raised trap through raise_user_trap.

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Jit

Fields

§pc: usize

The program counter where this trap originated.

This is later used with side tables from compilation to translate the trapping address to a trap code.

§faulting_addr: Option<usize>

If the trap was a memory-related trap such as SIGSEGV then this field will contain the address of the inaccessible data.

Note that wasm loads/stores are not guaranteed to fill in this information. Dynamically-bounds-checked memories, for example, will not access an invalid address but may instead load from NULL or may explicitly jump to a ud2 instruction. This is only available for fault-based traps which are one of the main ways, but not the only way, to run wasm.

A trap raised from Cranelift-generated code.

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Wasm(Trap)

A trap raised from a wasm libcall

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impl TrapReason

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pub fn user_without_backtrace(error: Error) -> Self

Create a new TrapReason::User that does not have a backtrace yet.

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pub fn user_with_backtrace(error: Error) -> Self

Create a new TrapReason::User that already has a backtrace.

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pub fn is_jit(&self) -> bool

Is this a JIT trap?

Trait Implementations§

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impl Debug for TrapReason

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl From<Error> for TrapReason

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fn from(err: Error) -> Self

Converts to this type from the input type.
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impl From<Trap> for TrapReason

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fn from(code: Trap) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.